250+ TOP MCQs on Working of a Steam Turbines and Answers

Steam and Gas Turbines Multiple Choice Questions on “Working of a Steam Turbines”.

1. _______ of electricity in United States is produced using steam turbine.
a) 88%
b) 50%
c) 100%
d) 77%

Answer: a
Clarification: 88% of electricity in United States is produced using steam turbine. US is one among the few countries that depends mostly on the steam turbine power plants.

2. When steam pressure ________ it becomes superficial fluid.
a) Decreases
b) Increases
c) Steam can not become superficial fluid
d) None of the mentioned

Answer: b
Clarification: When steam pressure increases it becomes superficial fluid. When pressure increases its temperature also gets increased then it changes into superficial fluid.

3. Steam turbines used in nuclear reactors use __________
a) Superficial fluids
b) High pressure steam
c) Specific heat
d) None of the mentioned

Answer: a
Clarification: Steam turbines used in nuclear reactors use superficial fluids. High pressure steam is also called as superficial fluid. Steam used in nuclear reactors need to have high kinetic energy where kinetic energy in superficial fluid is sufficient for nuclear reactor.

4. ________ and pressure of the superficial steam are at critical points.
a) Specific heat
b) Volume
c) Temperature
d) None of the mentioned

Answer: c
Clarification: Temperature and pressure of the superficial steam are at critical points. Critical point is the point at which steam changes its phase.

5. Superficial steam power plants operate at _____ temperatures.
a) high
b) low
c) constant
d) none of the mentioned

Answer: a
Clarification: Superficial steam power plants operate at high temperatures. Superficial steam has high pressure which means for steam to get into superficial state high temperature is required.

6. Energy efficiency of superficial steam is _________
a) low
b) high
c) same as other steams
d) none of the mentioned

Answer: b
Clarification: Energy efficiency of superficial steam is very high. As temperature of superficial steam is very high it leads to high energy efficiency.

7. Superficial steam turbines can be operated at ________
a) medium speeds
b) low speeds
c) high speeds
d) none of the mentioned

Answer: c
Clarification: Superficial steam turbines can be operated at high speeds. Because it produces high heat energy which can be converted into rotational energy.

8. Superficial steam turbines releases _______ CO₂.
a) high
b) low
c) does not release
d) none of the mentioned

Answer: a
Clarification: Superficial steam turbine releases less pollutants. Because there will be less wastage of heat and hence pollutants are controlled.

9. In double acting steam engine pressure acts on the both sides of the valves.
a) True
b) False

Answer: a
Clarification: In double acting steam engine pressure acts on the both sides of the valves. That is why those steam engines are called as double acting steam engines.

10. Boiler extracts heat from the working fluid.
a) True
b) False

Answer: a
Clarification: Boiler extracts the amount of heat from the working fluid. When fluid is boiled inside the boiler it releases the heat energy.